BirdAnalyst
Species · Maine · BBS 2026 Release · 1966–2025

Blue Jay Population Trend in Maine

All statesForest birds

Blue Jay in Maine has edged down: down 24% on the route-weighted index since 1968.

-24%Since 1968TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
78Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Blue Jay Trends in MaineNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Blue Jay in Maine. See the full index history below.

Blue Jay Population Forecast in Maine

If the recent trend holds, Blue Jay in Maine is projected to stay roughly flat through 2030, near 9.3 (95% range 5.4–13). A 5-year backtest shows a typical error of ±18.4%, with 100% of held-out values landing inside the 95% band.

-5%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
9.3Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
5.4–1395% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±18.4%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Blue Jay in Maine is projected to stay roughly flat through 2030, near 9.3 (95% range 5.4–13). A 5-year backtest shows a typical error of ±18.4%, with 100% of held-out values landing inside the 95% band.19662030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20269.45.613
20279.45.513
20289.45.513
20299.35.513
20309.35.413

Blue Jay Survey Routes in Maine

Routes recording Blue Jay in Maine.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Pillsbury Pd4119681968
Brooks2820211977
Rome2620241996
Hermon2520211966
Northfield2519811976
Hudson2420161973
Aurora2320211975
East Troy2220211972
Wytopitlock2120251976
Forest Sta1920001966
Carrying Pl1820251979
Washburn1620051979
Greenwood1520251966
Reeds1520251983
Otisfield Gr1520151966
Benedicta1520221976
Brownfield1520092009
Ashland1420081980
St David1420051982
Andover1420212010
Hancock1320251969
Waite1319771977
Yankeetuladi1320081994
Baker Lake 21320132010
Manchester1219951971

Blue Jay Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.